Mount Desire Dyke is designated place of geological significance. It is located north-east of
Hawker
Hawker or Hawkers may refer to:
Places
* Hawker, Australian Capital Territory, a suburb of Canberra
* Hawker, South Australia, a town
* Division of Hawker, an Electoral Division in South Australia
* Hawker Island, Princess Elizabeth Land, Antarct ...
in
South Australia
South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. It covers some of the most arid parts of the country. With a total land area of , it is the fourth-largest of Australia's states and territories ...
, on the edge of the
Flinders Ranges
The Flinders Ranges are the largest mountain range in South Australia, which starts about north of Adelaide. The ranges stretch for over from Port Pirie to Lake Callabonna.
The Adnyamathanha people are the Aboriginal group who have inhabit ...
. The
dyke (or dike) is a rock structure where mobile material, being a breccia of rock salt and rubble (as in 'salt diapirs') has intruded into cracks in folded Adelaidean sediments in the geological past
[PhD thesis of Trev J Mount, 1975, on "Diapirs and diapirism in the Adelaide Geosyncline" (Flinders Ranges) now is published online (free download) by the Department of Energy & Mining (Geological Survey of South Australia) as Report Book 2021/00006]
The site was added to the
South Australian Heritage Register
The South Australian Heritage Register, also known as the SA Heritage Register, is a statutory register of historic places in South Australia
South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. ...
on 30 March 1998. Its significance is described as follows:
This site contains a number of features of considerable importance to research and debate concerning the nature and origin of the Mt Desire Dyke and other diapirs of the Flinders Ranges, including: typical dolomitic-vanished evaporite breccia and dolostone/metasediment xenoclasts (to km in size) of probable Willouran origin; sharp irregular and distinctive contacts with early Cambrian units such as the Mernmerna Formation, Oraparinna Shale, and Wilkawillina Limestones, including a particularly important apophysis interpreted as an intrusive re-entrant; and significant brecciation in, and metamorphic incongruence between, the material of the dyke and the adjacent Cambrian limestones.
See also
*Geology of South Australia
South Australia is an Australian state, situated in the southern central part of the country, and featuring some low-lying mountain ranges, the most significant being the Mount Lofty Ranges, which extend into the state's capital city, Adelaide, ...
References
category:Far North (South Australia)
South Australian Heritage Register
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